Fault tolerant generator or starter/generator with low torque ripple

Abstract

A fault tolerant generator apparatus includes subsystems isolated from each other, so that the generator may operate in a fault mode with low torque ripple. The apparatus comprises a machine and a power controller unit. In an embodiment, the machine has a plurality of electrical three phase windings and the power controller unit has a plurality of power converters. Each three phase winding of the machine is coupled to a separate corresponding power converter to form an operating subsystem. The operating subsystems are physically and electrically isolated from each other to provide fault tolerant operation of the apparatus. Accordingly, each of the operating subsystems is effective to provide a balanced electrical load for the machine.

Description

FIELD OF THE DISCLOSURE[0001]This disclosure relates to generator and starter / generator systems for small engine applications, particularly in applications where fault-tolerant operation is desired.BACKGROUND OF THE DISCLOSURE[0002]Fault tolerant capability (that is, the ability to continue to operate, at full or reduced capacity, in the presence of a fault within one or more elements) is often required in generator or starter / generator systems used in applications requiring a high level of reliability. A typical generator system 1, shown schematically in FIG. 1, includes a machine (e.g. a permanent magnet alternator or PMA) 2 coupled to a power controller (e.g. power conversion unit or PCU) 3, which provides DC output power at terminals 5. Fault tolerant subsystems may be implemented by configuring one or more functions within the machine and / or the power controller with redundant or multiple elements. Fault tolerant system architectures, including use of multiple isolated windings...

AI Technical Summary

Benefits of technology

The present disclosure provides a fault tolerant generator that can operate in a fault mode with low torque ripple. The generator includes subsystems that are physically and electrically isolated from each other, making them effective to provide a balanced electrical load for the machine. This isolation ensures that each subsystem is able to operate independently, reducing the impact of any faults that may occur. The generator is suitable for use in various machines such as a permanent magnet alternator, DC generator, AC generator, and DC motor. The technical effect of the disclosure is to provide a reliable and efficient fault tolerant generator that can operate in a fault mode with low torque ripple.

Problems solved by technology

When operating in this fault mode, the machine loads are typically unbalanced, which can result in significant levels of torque ripple.

The high levels of torque ripple can cause damage to the machine, its drive system and / or the prime mover.

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